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STV2001 Datasheet(PDF) 33 Page - STMicroelectronics

Part No. STV2001
Description  I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 120 MHz RGB PREAMPLIFIER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STV2001 Datasheet(HTML) 33 Page - STMicroelectronics

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14.4.2 - Contrast Adjustment (7 bits)
The contrast adjustment is made by simultaneous-
ly controlling the gain of three internal variable
gain amplifiers through the I2C bus interface. The
contrast adjustment allows covering a range high-
er than 40 dB. This adjustment is refreshed during
the vertical retrace time.
14.4.3 - ABL Control
The STV2001 has an ABL input (automatic beam
limitation) to attenuate RGB video signals accord-
ing to beam intensity.
The operating range is typically 2.5 V, from 5.3 V
to 2.8 V. A typical 12 dB Max. attenuation is ap-
plied to the signal whatever the current gain. Refer
to Figure 16 for ABL input attenuation range.
In the case of software control, the ABL input must
be pulled to AVCC through a resistor to limit power
consumption.
ABL input voltage must not exceed VAVCC. Input
resistor is 10k
.
Figure 17.
14.4.4 - Brightness Adjustment (6 bits)
As with contrast adjustment, brightness is control-
led by I2C.
The brightness function consists of adding the
same DC offset to the three R, G, B signals after
contrast amplification. This DC-Offset is present
only outside the blanking pulse (see Figure 19).
The DC output level is forced to "INFRA-BLACK"
level (VDC) during the blanking pulse.
14.4.5 - Drive Adjustment (3 x 8 bits)
To adjust the white balance, the device offers the
possibility of separately adjusting the overall gain
of each complete video channel. Each channel
gain is controlled by I2C (8 bits each). The very
large drive adjustment range (48dB) allows differ-
ent standard or custom color temperatures.
The drive adjustment is also used to adjust the
output voltages at the optimum amplitude to drive
the C.R.T drivers, keeping the whole contrast con-
trol for end-users only. The drive adjustment is
made after the contrast and brightness so that the
white balance remains correct when BRT is ad-
justed.
14.4.6 - Output Stage
The three output stages (see Figure 18) incorpo-
rate three functions:
The
blanking
stage:
when
the
internal
generated blanking pulse is high, the three
outputs are switched to a voltage which is
400 mV
lower than the BLACK level. The
black level is the output voltage with minimum
brightness
when
the
input
signal
video
amplitude is equal to "0".
The output stage itself: a large bandwidth
output amplifier which can deliver up to 5VPP
on the three outputs (for 0.7 V video signal on
the inputs).
The output CLAMP: the IC also incorporates
three internal output clamps (sample and hold
system) to fix the "INFRA-BLACK" level
(VDC) at 1.1V during blanking.
The overall waveforms of the output signal accord-
ing to the different adjustments are shown in
Figure 19. and Figure 20.
2
0
-2
-4
-6
-8
-10
-12
-14
12
34
56
7
8
9
Attenuation (dB)
V
IN
(V)


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